使用 java-configuration 配置 MappingJackson2HttpMessageConverter答案

【问题标题】：Configure MappingJackson2HttpMessageConverter by using java-configuration使用 java-configuration 配置 MappingJackson2HttpMessageConverter
【发布时间】：2016-08-22 18:11:21
【问题描述】：

我正在尝试配置 MappingJackson2HttpMessageConverter，因为我想禁用 WRITE_DATES_TO_TIMESTAMP 功能。

如果我通过 xml-configuration 配置它，它会成功运行

<bean name="jacksonObjectMapper"
    class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
    <property name="featuresToDisable">
        <array>
            <util:constant
                static-field="com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS" />
        </array>
    </property>
</bean>
<mvc:annotation-driven>
    <mvc:message-converters register-defaults="true">
        <bean
            class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper" ref="jacksonObjectMapper" />
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

但是当我尝试通过 java-configuration 进行配置时，转换器已注册但序列化忽略了映射器的配置。

我尝试了不同的方法。

方法 1

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    ObjectMapper mapper = new ObjectMapper();
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    converters.add(new MappingJackson2HttpMessageConverter(mapper));
}
}

方法 2

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
    for (HttpMessageConverter<?> converter : converters) {
        if (converter instanceof MappingJackson2HttpMessageConverter) {
        MappingJackson2HttpMessageConverter jacksonMessageConverter = (MappingJackson2HttpMessageConverter) converter;
        ObjectMapper objectMapper = jacksonMessageConverter.getObjectMapper();
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        break;
        }
    }
}

}

【问题讨论】：

标签： java spring spring-mvc jackson converter

【解决方案1】：

试试下面的方法：

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

    ...
    @Override
    public void configureMessageConverters(
        List<HttpMessageConverter<?>> converters) {
        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
        builder.dateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm"));
        builder.featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        converters.add(new MappingJackson2HttpMessageConverter(builder.build()));
    }
    ...
}

【讨论】：

【解决方案2】：

这也适用于我

@Bean
public Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder() {
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    return builder;
}

【讨论】：

【解决方案3】：

也许您在 xml 中仍然有注释驱动？

其中还注册了默认的 messageConverters 和 objectmappers。

【讨论】：